Federal Motor Carrier Safety Administration (FMCSA) requires all entities under its jurisdiction to update their information every two years.
For that reason, there is no plan to remove the classic PDC support.
When processing your change of address, DMV updates your records immediately and at your request mails you an address sticker.
The change of address sticker is to be placed directly over your former residence address on the front of your driver license, instruction permit or ID card. Postal Service information or you enter an out-of-country address, you will receive an error message and you will have to use one of the other address change options listed above to inform DMV of your new address.
Additionally, all recent versions continue to support setting up a new NT4-style PDC.
The AD support in Samba 4.0 and later is optional and does not replace any of the PDC features.